Archaeologists working near Kilteasheen, Ireland unearthed two skeletons from the 8th century buried with stones in their mouths. The reigning theory is that this was done to prevent their return from the grave. There, too, seemed something special about where they were buried since the two men were buried at different times and were of drastically different ages and yet laid to rest together, sometime in the 700s. Middle Ages burials elsewhere have associated this practice as a way to deal with potential vampires and other undead. However, the folklore surrounding that tradition didn't emerge throughout Europe until the 1500s. Still, the archaelogists from the Institute of Technology in Sligo think this may still have been done to prevent revenants, a term for ghosts or animated corpses. It is likely these men were outcasts from the whole of society, such as criminals or victims of some unexplained disease. This would explain why such lengths were taken not only to bury them in a special area, but also to make sure they stayed buried.